PHP ActiveX

Get the Root of a JSON Document

See more JSON Examples

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

PHP ActiveX

<?php

$success = 0;

$json = new COM("Chilkat.JsonObject");

$jsonStr = '{\'flower\': \'tulip\',\'abc\':{\'x\': [{ \'a\' : 1 },{ \'b1\' : 100, \'b2\' : 200 },{ \'c\' : 3 }],\'y\': 200,\'z\': 200}}';

$success = $json->Load($jsonStr);
if ($success == 0) {
    print $json->LastErrorText . "\n";
    exit;
}

// Get the "abc" object.
$abcObj = new COM("Chilkat.JsonObject");
$success = $json->ObjectOf2('abc',$abcObj);
if ($success == 0) {
    print $json->LastErrorText . "\n";
    exit;
}

// Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
$abcObj->EmitCompact = 0;
print $abcObj->emit() . "\n";

// Navigate to the "x" array
$xArray = new COM("Chilkat.JsonArray");
$abcObj->ArrayOf2('x',$xArray);

// Navigate to the 2nd object contained within the array.  This contains members b1 and b2
$bObj = new COM("Chilkat.JsonObject");
$xArray->ObjectAt2(1,$bObj);

// Show that we're at "b1/b2".
// The value of "b1" should be "200"
print 'b2 = ' . $bObj->IntOf('b2') . "\n";

// Now go back to the JSON doc root:
$docRoot = new COM("Chilkat.JsonObject");
$bObj->GetDocRoot2($docRoot);

// We'll skip the null check and assume it's non-null...

// Pretty-print the JSON doc from the root to show that this is indeed the root.
$docRoot->EmitCompact = 0;
print $docRoot->emit() . "\n";

?>